Dovizioso struggling for pace on day one at Jerez

Ducati's Andrea Dovizioso has vowed to remain 'calm' after struggling for grip during first day of practice at Jerez, finishes 12th fastest on GP13

Andrea Dovizioso was at a loss to explain the difficulties he faced as practice for the Jerez MotoGP got under way in Spain on Friday.

Dovi's best lap time of 1m 40.884s left him in 12th position overall based on the combined times from FP1 and FP2, 0.018s ahead of Ducati test rider Michele Pirro and behind Pramac Racing's Andrea Iannone and Nicky Hayden on the second factory GP13.

"It was really difficult this afternoon, and I'm not completely sure why," he said.

"The grip was much worse for all the Ducati riders, and it was much harder for me to be precise and stay on my lines.